2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c)2006,2007,2008,2009 YAMAMOTO Takashi,
5 * Copyright (c) 2013 EMC Corp.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $NetBSD: vmem_impl.h,v 1.2 2013/01/29 21:26:24 para Exp $
33 * $NetBSD: subr_vmem.c,v 1.83 2013/03/06 11:20:10 yamt Exp $
38 * - Magazines and Vmem: Extending the Slab Allocator
39 * to Many CPUs and Arbitrary Resources
40 * http://www.usenix.org/event/usenix01/bonwick.html
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/kernel.h>
51 #include <sys/queue.h>
52 #include <sys/callout.h>
55 #include <sys/malloc.h>
56 #include <sys/mutex.h>
58 #include <sys/condvar.h>
59 #include <sys/sysctl.h>
60 #include <sys/taskqueue.h>
62 #include <sys/vmmeter.h>
69 #include <vm/vm_map.h>
70 #include <vm/vm_object.h>
71 #include <vm/vm_kern.h>
72 #include <vm/vm_extern.h>
73 #include <vm/vm_param.h>
74 #include <vm/vm_page.h>
75 #include <vm/vm_pageout.h>
76 #include <vm/vm_phys.h>
77 #include <vm/vm_pagequeue.h>
78 #include <vm/uma_int.h>
80 #define VMEM_OPTORDER 5
81 #define VMEM_OPTVALUE (1 << VMEM_OPTORDER)
82 #define VMEM_MAXORDER \
83 (VMEM_OPTVALUE - 1 + sizeof(vmem_size_t) * NBBY - VMEM_OPTORDER)
85 #define VMEM_HASHSIZE_MIN 16
86 #define VMEM_HASHSIZE_MAX 131072
88 #define VMEM_QCACHE_IDX_MAX 16
90 #define VMEM_FITMASK (M_BESTFIT | M_FIRSTFIT | M_NEXTFIT)
92 #define VMEM_FLAGS (M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_NOVM | \
93 M_BESTFIT | M_FIRSTFIT | M_NEXTFIT)
95 #define BT_FLAGS (M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_NOVM)
97 #define QC_NAME_MAX 16
100 * Data structures private to vmem.
102 MALLOC_DEFINE(M_VMEM, "vmem", "vmem internal structures");
104 typedef struct vmem_btag bt_t;
106 TAILQ_HEAD(vmem_seglist, vmem_btag);
107 LIST_HEAD(vmem_freelist, vmem_btag);
108 LIST_HEAD(vmem_hashlist, vmem_btag);
114 char qc_name[QC_NAME_MAX];
116 typedef struct qcache qcache_t;
117 #define QC_POOL_TO_QCACHE(pool) ((qcache_t *)(pool->pr_qcache))
119 #define VMEM_NAME_MAX 16
123 TAILQ_ENTRY(vmem_btag) bt_seglist;
125 LIST_ENTRY(vmem_btag) u_freelist; /* BT_TYPE_FREE */
126 LIST_ENTRY(vmem_btag) u_hashlist; /* BT_TYPE_BUSY */
128 #define bt_hashlist bt_u.u_hashlist
129 #define bt_freelist bt_u.u_freelist
130 vmem_addr_t bt_start;
137 struct mtx_padalign vm_lock;
139 char vm_name[VMEM_NAME_MAX+1];
140 LIST_ENTRY(vmem) vm_alllist;
141 struct vmem_hashlist vm_hash0[VMEM_HASHSIZE_MIN];
142 struct vmem_freelist vm_freelist[VMEM_MAXORDER];
143 struct vmem_seglist vm_seglist;
144 struct vmem_hashlist *vm_hashlist;
145 vmem_size_t vm_hashsize;
147 /* Constant after init */
148 vmem_size_t vm_qcache_max;
149 vmem_size_t vm_quantum_mask;
150 vmem_size_t vm_import_quantum;
151 int vm_quantum_shift;
153 /* Written on alloc/free */
154 LIST_HEAD(, vmem_btag) vm_freetags;
157 vmem_size_t vm_inuse;
159 vmem_size_t vm_limit;
160 struct vmem_btag vm_cursor;
162 /* Used on import. */
163 vmem_import_t *vm_importfn;
164 vmem_release_t *vm_releasefn;
167 /* Space exhaustion callback. */
168 vmem_reclaim_t *vm_reclaimfn;
171 qcache_t vm_qcache[VMEM_QCACHE_IDX_MAX];
174 #define BT_TYPE_SPAN 1 /* Allocated from importfn */
175 #define BT_TYPE_SPAN_STATIC 2 /* vmem_add() or create. */
176 #define BT_TYPE_FREE 3 /* Available space. */
177 #define BT_TYPE_BUSY 4 /* Used space. */
178 #define BT_TYPE_CURSOR 5 /* Cursor for nextfit allocations. */
179 #define BT_ISSPAN_P(bt) ((bt)->bt_type <= BT_TYPE_SPAN_STATIC)
181 #define BT_END(bt) ((bt)->bt_start + (bt)->bt_size - 1)
183 #if defined(DIAGNOSTIC)
184 static int enable_vmem_check = 1;
185 SYSCTL_INT(_debug, OID_AUTO, vmem_check, CTLFLAG_RWTUN,
186 &enable_vmem_check, 0, "Enable vmem check");
187 static void vmem_check(vmem_t *);
190 static struct callout vmem_periodic_ch;
191 static int vmem_periodic_interval;
192 static struct task vmem_periodic_wk;
194 static struct mtx_padalign __exclusive_cache_line vmem_list_lock;
195 static LIST_HEAD(, vmem) vmem_list = LIST_HEAD_INITIALIZER(vmem_list);
196 static uma_zone_t vmem_zone;
199 #define VMEM_CONDVAR_INIT(vm, wchan) cv_init(&vm->vm_cv, wchan)
200 #define VMEM_CONDVAR_DESTROY(vm) cv_destroy(&vm->vm_cv)
201 #define VMEM_CONDVAR_WAIT(vm) cv_wait(&vm->vm_cv, &vm->vm_lock)
202 #define VMEM_CONDVAR_BROADCAST(vm) cv_broadcast(&vm->vm_cv)
204 #define VMEM_LOCK(vm) mtx_lock(&vm->vm_lock)
205 #define VMEM_TRYLOCK(vm) mtx_trylock(&vm->vm_lock)
206 #define VMEM_UNLOCK(vm) mtx_unlock(&vm->vm_lock)
207 #define VMEM_LOCK_INIT(vm, name) mtx_init(&vm->vm_lock, (name), NULL, MTX_DEF)
208 #define VMEM_LOCK_DESTROY(vm) mtx_destroy(&vm->vm_lock)
209 #define VMEM_ASSERT_LOCKED(vm) mtx_assert(&vm->vm_lock, MA_OWNED);
211 #define VMEM_ALIGNUP(addr, align) (-(-(addr) & -(align)))
213 #define VMEM_CROSS_P(addr1, addr2, boundary) \
214 ((((addr1) ^ (addr2)) & -(boundary)) != 0)
216 #define ORDER2SIZE(order) ((order) < VMEM_OPTVALUE ? ((order) + 1) : \
217 (vmem_size_t)1 << ((order) - (VMEM_OPTVALUE - VMEM_OPTORDER - 1)))
218 #define SIZE2ORDER(size) ((size) <= VMEM_OPTVALUE ? ((size) - 1) : \
219 (flsl(size) + (VMEM_OPTVALUE - VMEM_OPTORDER - 2)))
222 * Maximum number of boundary tags that may be required to satisfy an
223 * allocation. Two may be required to import. Another two may be
224 * required to clip edges.
226 #define BT_MAXALLOC 4
229 * Max free limits the number of locally cached boundary tags. We
230 * just want to avoid hitting the zone allocator for every call.
232 #define BT_MAXFREE (BT_MAXALLOC * 8)
234 /* Allocator for boundary tags. */
235 static uma_zone_t vmem_bt_zone;
237 /* boot time arena storage. */
238 static struct vmem kernel_arena_storage;
239 static struct vmem buffer_arena_storage;
240 static struct vmem transient_arena_storage;
241 /* kernel and kmem arenas are aliased for backwards KPI compat. */
242 vmem_t *kernel_arena = &kernel_arena_storage;
243 vmem_t *kmem_arena = &kernel_arena_storage;
244 vmem_t *buffer_arena = &buffer_arena_storage;
245 vmem_t *transient_arena = &transient_arena_storage;
247 #ifdef DEBUG_MEMGUARD
248 static struct vmem memguard_arena_storage;
249 vmem_t *memguard_arena = &memguard_arena_storage;
253 * Fill the vmem's boundary tag cache. We guarantee that boundary tag
254 * allocation will not fail once bt_fill() passes. To do so we cache
255 * at least the maximum possible tag allocations in the arena.
258 bt_fill(vmem_t *vm, int flags)
262 VMEM_ASSERT_LOCKED(vm);
265 * Only allow the kernel arena and arenas derived from kernel arena to
266 * dip into reserve tags. They are where new tags come from.
269 if (vm != kernel_arena && vm->vm_arg != kernel_arena)
270 flags &= ~M_USE_RESERVE;
273 * Loop until we meet the reserve. To minimize the lock shuffle
274 * and prevent simultaneous fills we first try a NOWAIT regardless
275 * of the caller's flags. Specify M_NOVM so we don't recurse while
276 * holding a vmem lock.
278 while (vm->vm_nfreetags < BT_MAXALLOC) {
279 bt = uma_zalloc(vmem_bt_zone,
280 (flags & M_USE_RESERVE) | M_NOWAIT | M_NOVM);
283 bt = uma_zalloc(vmem_bt_zone, flags);
288 LIST_INSERT_HEAD(&vm->vm_freetags, bt, bt_freelist);
292 if (vm->vm_nfreetags < BT_MAXALLOC)
299 * Pop a tag off of the freetag stack.
306 VMEM_ASSERT_LOCKED(vm);
307 bt = LIST_FIRST(&vm->vm_freetags);
309 LIST_REMOVE(bt, bt_freelist);
316 * Trim the per-vmem free list. Returns with the lock released to
317 * avoid allocator recursions.
320 bt_freetrim(vmem_t *vm, int freelimit)
322 LIST_HEAD(, vmem_btag) freetags;
325 LIST_INIT(&freetags);
326 VMEM_ASSERT_LOCKED(vm);
327 while (vm->vm_nfreetags > freelimit) {
328 bt = LIST_FIRST(&vm->vm_freetags);
329 LIST_REMOVE(bt, bt_freelist);
331 LIST_INSERT_HEAD(&freetags, bt, bt_freelist);
334 while ((bt = LIST_FIRST(&freetags)) != NULL) {
335 LIST_REMOVE(bt, bt_freelist);
336 uma_zfree(vmem_bt_zone, bt);
341 bt_free(vmem_t *vm, bt_t *bt)
344 VMEM_ASSERT_LOCKED(vm);
345 MPASS(LIST_FIRST(&vm->vm_freetags) != bt);
346 LIST_INSERT_HEAD(&vm->vm_freetags, bt, bt_freelist);
351 * freelist[0] ... [1, 1]
352 * freelist[1] ... [2, 2]
354 * freelist[29] ... [30, 30]
355 * freelist[30] ... [31, 31]
356 * freelist[31] ... [32, 63]
357 * freelist[33] ... [64, 127]
359 * freelist[n] ... [(1 << (n - 26)), (1 << (n - 25)) - 1]
363 static struct vmem_freelist *
364 bt_freehead_tofree(vmem_t *vm, vmem_size_t size)
366 const vmem_size_t qsize = size >> vm->vm_quantum_shift;
367 const int idx = SIZE2ORDER(qsize);
369 MPASS(size != 0 && qsize != 0);
370 MPASS((size & vm->vm_quantum_mask) == 0);
372 MPASS(idx < VMEM_MAXORDER);
374 return &vm->vm_freelist[idx];
378 * bt_freehead_toalloc: return the freelist for the given size and allocation
381 * For M_FIRSTFIT, return the list in which any blocks are large enough
382 * for the requested size. otherwise, return the list which can have blocks
383 * large enough for the requested size.
385 static struct vmem_freelist *
386 bt_freehead_toalloc(vmem_t *vm, vmem_size_t size, int strat)
388 const vmem_size_t qsize = size >> vm->vm_quantum_shift;
389 int idx = SIZE2ORDER(qsize);
391 MPASS(size != 0 && qsize != 0);
392 MPASS((size & vm->vm_quantum_mask) == 0);
394 if (strat == M_FIRSTFIT && ORDER2SIZE(idx) != qsize) {
396 /* check too large request? */
399 MPASS(idx < VMEM_MAXORDER);
401 return &vm->vm_freelist[idx];
404 /* ---- boundary tag hash */
406 static struct vmem_hashlist *
407 bt_hashhead(vmem_t *vm, vmem_addr_t addr)
409 struct vmem_hashlist *list;
412 hash = hash32_buf(&addr, sizeof(addr), 0);
413 list = &vm->vm_hashlist[hash % vm->vm_hashsize];
419 bt_lookupbusy(vmem_t *vm, vmem_addr_t addr)
421 struct vmem_hashlist *list;
424 VMEM_ASSERT_LOCKED(vm);
425 list = bt_hashhead(vm, addr);
426 LIST_FOREACH(bt, list, bt_hashlist) {
427 if (bt->bt_start == addr) {
436 bt_rembusy(vmem_t *vm, bt_t *bt)
439 VMEM_ASSERT_LOCKED(vm);
440 MPASS(vm->vm_nbusytag > 0);
441 vm->vm_inuse -= bt->bt_size;
443 LIST_REMOVE(bt, bt_hashlist);
447 bt_insbusy(vmem_t *vm, bt_t *bt)
449 struct vmem_hashlist *list;
451 VMEM_ASSERT_LOCKED(vm);
452 MPASS(bt->bt_type == BT_TYPE_BUSY);
454 list = bt_hashhead(vm, bt->bt_start);
455 LIST_INSERT_HEAD(list, bt, bt_hashlist);
457 vm->vm_inuse += bt->bt_size;
460 /* ---- boundary tag list */
463 bt_remseg(vmem_t *vm, bt_t *bt)
466 MPASS(bt->bt_type != BT_TYPE_CURSOR);
467 TAILQ_REMOVE(&vm->vm_seglist, bt, bt_seglist);
472 bt_insseg(vmem_t *vm, bt_t *bt, bt_t *prev)
475 TAILQ_INSERT_AFTER(&vm->vm_seglist, prev, bt, bt_seglist);
479 bt_insseg_tail(vmem_t *vm, bt_t *bt)
482 TAILQ_INSERT_TAIL(&vm->vm_seglist, bt, bt_seglist);
486 bt_remfree(vmem_t *vm, bt_t *bt)
489 MPASS(bt->bt_type == BT_TYPE_FREE);
491 LIST_REMOVE(bt, bt_freelist);
495 bt_insfree(vmem_t *vm, bt_t *bt)
497 struct vmem_freelist *list;
499 list = bt_freehead_tofree(vm, bt->bt_size);
500 LIST_INSERT_HEAD(list, bt, bt_freelist);
503 /* ---- vmem internal functions */
506 * Import from the arena into the quantum cache in UMA.
508 * We use VMEM_ADDR_QCACHE_MIN instead of 0: uma_zalloc() returns 0 to indicate
509 * failure, so UMA can't be used to cache a resource with value 0.
512 qc_import(void *arg, void **store, int cnt, int domain, int flags)
518 KASSERT((flags & M_WAITOK) == 0, ("blocking allocation"));
521 for (i = 0; i < cnt; i++) {
522 if (vmem_xalloc(qc->qc_vmem, qc->qc_size, 0, 0, 0,
523 VMEM_ADDR_QCACHE_MIN, VMEM_ADDR_MAX, flags, &addr) != 0)
525 store[i] = (void *)addr;
531 * Release memory from the UMA cache to the arena.
534 qc_release(void *arg, void **store, int cnt)
540 for (i = 0; i < cnt; i++)
541 vmem_xfree(qc->qc_vmem, (vmem_addr_t)store[i], qc->qc_size);
545 qc_init(vmem_t *vm, vmem_size_t qcache_max)
552 MPASS((qcache_max & vm->vm_quantum_mask) == 0);
553 qcache_idx_max = MIN(qcache_max >> vm->vm_quantum_shift,
554 VMEM_QCACHE_IDX_MAX);
555 vm->vm_qcache_max = qcache_idx_max << vm->vm_quantum_shift;
556 for (i = 0; i < qcache_idx_max; i++) {
557 qc = &vm->vm_qcache[i];
558 size = (i + 1) << vm->vm_quantum_shift;
559 snprintf(qc->qc_name, sizeof(qc->qc_name), "%s-%zu",
563 qc->qc_cache = uma_zcache_create(qc->qc_name, size,
564 NULL, NULL, NULL, NULL, qc_import, qc_release, qc,
571 qc_destroy(vmem_t *vm)
576 qcache_idx_max = vm->vm_qcache_max >> vm->vm_quantum_shift;
577 for (i = 0; i < qcache_idx_max; i++)
578 uma_zdestroy(vm->vm_qcache[i].qc_cache);
587 qcache_idx_max = vm->vm_qcache_max >> vm->vm_quantum_shift;
588 for (i = 0; i < qcache_idx_max; i++)
589 uma_zone_reclaim(vm->vm_qcache[i].qc_cache, UMA_RECLAIM_DRAIN);
592 #ifndef UMA_MD_SMALL_ALLOC
594 static struct mtx_padalign __exclusive_cache_line vmem_bt_lock;
597 * vmem_bt_alloc: Allocate a new page of boundary tags.
599 * On architectures with uma_small_alloc there is no recursion; no address
600 * space need be allocated to allocate boundary tags. For the others, we
601 * must handle recursion. Boundary tags are necessary to allocate new
604 * UMA guarantees that enough tags are held in reserve to allocate a new
605 * page of kva. We dip into this reserve by specifying M_USE_RESERVE only
606 * when allocating the page to hold new boundary tags. In this way the
607 * reserve is automatically filled by the allocation that uses the reserve.
609 * We still have to guarantee that the new tags are allocated atomically since
610 * many threads may try concurrently. The bt_lock provides this guarantee.
611 * We convert WAITOK allocations to NOWAIT and then handle the blocking here
612 * on failure. It's ok to return NULL for a WAITOK allocation as UMA will
613 * loop again after checking to see if we lost the race to allocate.
615 * There is a small race between vmem_bt_alloc() returning the page and the
616 * zone lock being acquired to add the page to the zone. For WAITOK
617 * allocations we just pause briefly. NOWAIT may experience a transient
618 * failure. To alleviate this we permit a small number of simultaneous
619 * fills to proceed concurrently so NOWAIT is less likely to fail unless
620 * we are really out of KVA.
623 vmem_bt_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
628 *pflag = UMA_SLAB_KERNEL;
631 * Single thread boundary tag allocation so that the address space
632 * and memory are added in one atomic operation.
634 mtx_lock(&vmem_bt_lock);
635 if (vmem_xalloc(vm_dom[domain].vmd_kernel_arena, bytes, 0, 0, 0,
636 VMEM_ADDR_MIN, VMEM_ADDR_MAX,
637 M_NOWAIT | M_NOVM | M_USE_RESERVE | M_BESTFIT, &addr) == 0) {
638 if (kmem_back_domain(domain, kernel_object, addr, bytes,
639 M_NOWAIT | M_USE_RESERVE) == 0) {
640 mtx_unlock(&vmem_bt_lock);
641 return ((void *)addr);
643 vmem_xfree(vm_dom[domain].vmd_kernel_arena, addr, bytes);
644 mtx_unlock(&vmem_bt_lock);
646 * Out of memory, not address space. This may not even be
647 * possible due to M_USE_RESERVE page allocation.
650 vm_wait_domain(domain);
653 mtx_unlock(&vmem_bt_lock);
655 * We're either out of address space or lost a fill race.
668 mtx_init(&vmem_list_lock, "vmem list lock", NULL, MTX_DEF);
669 vmem_zone = uma_zcreate("vmem",
670 sizeof(struct vmem), NULL, NULL, NULL, NULL,
671 UMA_ALIGN_PTR, UMA_ZONE_VM);
672 vmem_bt_zone = uma_zcreate("vmem btag",
673 sizeof(struct vmem_btag), NULL, NULL, NULL, NULL,
674 UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE);
675 #ifndef UMA_MD_SMALL_ALLOC
676 mtx_init(&vmem_bt_lock, "btag lock", NULL, MTX_DEF);
677 uma_prealloc(vmem_bt_zone, BT_MAXALLOC);
679 * Reserve enough tags to allocate new tags. We allow multiple
680 * CPUs to attempt to allocate new tags concurrently to limit
681 * false restarts in UMA. vmem_bt_alloc() allocates from a per-domain
682 * arena, which may involve importing a range from the kernel arena,
683 * so we need to keep at least 2 * BT_MAXALLOC tags reserved.
685 uma_zone_reserve(vmem_bt_zone, 2 * BT_MAXALLOC * mp_ncpus);
686 uma_zone_set_allocf(vmem_bt_zone, vmem_bt_alloc);
693 vmem_rehash(vmem_t *vm, vmem_size_t newhashsize)
697 struct vmem_hashlist *newhashlist;
698 struct vmem_hashlist *oldhashlist;
699 vmem_size_t oldhashsize;
701 MPASS(newhashsize > 0);
703 newhashlist = malloc(sizeof(struct vmem_hashlist) * newhashsize,
705 if (newhashlist == NULL)
707 for (i = 0; i < newhashsize; i++) {
708 LIST_INIT(&newhashlist[i]);
712 oldhashlist = vm->vm_hashlist;
713 oldhashsize = vm->vm_hashsize;
714 vm->vm_hashlist = newhashlist;
715 vm->vm_hashsize = newhashsize;
716 if (oldhashlist == NULL) {
720 for (i = 0; i < oldhashsize; i++) {
721 while ((bt = LIST_FIRST(&oldhashlist[i])) != NULL) {
728 if (oldhashlist != vm->vm_hash0) {
729 free(oldhashlist, M_VMEM);
736 vmem_periodic_kick(void *dummy)
739 taskqueue_enqueue(taskqueue_thread, &vmem_periodic_wk);
743 vmem_periodic(void *unused, int pending)
749 mtx_lock(&vmem_list_lock);
750 LIST_FOREACH(vm, &vmem_list, vm_alllist) {
752 /* Convenient time to verify vmem state. */
753 if (enable_vmem_check == 1) {
759 desired = 1 << flsl(vm->vm_nbusytag);
760 desired = MIN(MAX(desired, VMEM_HASHSIZE_MIN),
762 current = vm->vm_hashsize;
764 /* Grow in powers of two. Shrink less aggressively. */
765 if (desired >= current * 2 || desired * 4 <= current)
766 vmem_rehash(vm, desired);
769 * Periodically wake up threads waiting for resources,
770 * so they could ask for reclamation again.
772 VMEM_CONDVAR_BROADCAST(vm);
774 mtx_unlock(&vmem_list_lock);
776 callout_reset(&vmem_periodic_ch, vmem_periodic_interval,
777 vmem_periodic_kick, NULL);
781 vmem_start_callout(void *unused)
784 TASK_INIT(&vmem_periodic_wk, 0, vmem_periodic, NULL);
785 vmem_periodic_interval = hz * 10;
786 callout_init(&vmem_periodic_ch, 1);
787 callout_reset(&vmem_periodic_ch, vmem_periodic_interval,
788 vmem_periodic_kick, NULL);
790 SYSINIT(vfs, SI_SUB_CONFIGURE, SI_ORDER_ANY, vmem_start_callout, NULL);
793 vmem_add1(vmem_t *vm, vmem_addr_t addr, vmem_size_t size, int type)
798 MPASS(type == BT_TYPE_SPAN || type == BT_TYPE_SPAN_STATIC);
799 MPASS((size & vm->vm_quantum_mask) == 0);
801 btspan = bt_alloc(vm);
802 btspan->bt_type = type;
803 btspan->bt_start = addr;
804 btspan->bt_size = size;
805 bt_insseg_tail(vm, btspan);
807 btfree = bt_alloc(vm);
808 btfree->bt_type = BT_TYPE_FREE;
809 btfree->bt_start = addr;
810 btfree->bt_size = size;
811 bt_insseg(vm, btfree, btspan);
812 bt_insfree(vm, btfree);
818 vmem_destroy1(vmem_t *vm)
823 * Drain per-cpu quantum caches.
828 * The vmem should now only contain empty segments.
831 MPASS(vm->vm_nbusytag == 0);
833 TAILQ_REMOVE(&vm->vm_seglist, &vm->vm_cursor, bt_seglist);
834 while ((bt = TAILQ_FIRST(&vm->vm_seglist)) != NULL)
837 if (vm->vm_hashlist != NULL && vm->vm_hashlist != vm->vm_hash0)
838 free(vm->vm_hashlist, M_VMEM);
842 VMEM_CONDVAR_DESTROY(vm);
843 VMEM_LOCK_DESTROY(vm);
844 uma_zfree(vmem_zone, vm);
848 vmem_import(vmem_t *vm, vmem_size_t size, vmem_size_t align, int flags)
853 if (vm->vm_importfn == NULL)
857 * To make sure we get a span that meets the alignment we double it
858 * and add the size to the tail. This slightly overestimates.
860 if (align != vm->vm_quantum_mask + 1)
861 size = (align * 2) + size;
862 size = roundup(size, vm->vm_import_quantum);
864 if (vm->vm_limit != 0 && vm->vm_limit < vm->vm_size + size)
868 * Hide MAXALLOC tags so we're guaranteed to be able to add this
869 * span and the tag we want to allocate from it.
871 MPASS(vm->vm_nfreetags >= BT_MAXALLOC);
872 vm->vm_nfreetags -= BT_MAXALLOC;
874 error = (vm->vm_importfn)(vm->vm_arg, size, flags, &addr);
876 vm->vm_nfreetags += BT_MAXALLOC;
880 vmem_add1(vm, addr, size, BT_TYPE_SPAN);
886 * vmem_fit: check if a bt can satisfy the given restrictions.
888 * it's a caller's responsibility to ensure the region is big enough
892 vmem_fit(const bt_t *bt, vmem_size_t size, vmem_size_t align,
893 vmem_size_t phase, vmem_size_t nocross, vmem_addr_t minaddr,
894 vmem_addr_t maxaddr, vmem_addr_t *addrp)
900 MPASS(bt->bt_size >= size); /* caller's responsibility */
903 * XXX assumption: vmem_addr_t and vmem_size_t are
904 * unsigned integer of the same size.
907 start = bt->bt_start;
908 if (start < minaddr) {
917 start = VMEM_ALIGNUP(start - phase, align) + phase;
918 if (start < bt->bt_start)
920 if (VMEM_CROSS_P(start, start + size - 1, nocross)) {
921 MPASS(align < nocross);
922 start = VMEM_ALIGNUP(start - phase, nocross) + phase;
924 if (start <= end && end - start >= size - 1) {
925 MPASS((start & (align - 1)) == phase);
926 MPASS(!VMEM_CROSS_P(start, start + size - 1, nocross));
927 MPASS(minaddr <= start);
928 MPASS(maxaddr == 0 || start + size - 1 <= maxaddr);
929 MPASS(bt->bt_start <= start);
930 MPASS(BT_END(bt) - start >= size - 1);
939 * vmem_clip: Trim the boundary tag edges to the requested start and size.
942 vmem_clip(vmem_t *vm, bt_t *bt, vmem_addr_t start, vmem_size_t size)
947 VMEM_ASSERT_LOCKED(vm);
948 MPASS(bt->bt_type == BT_TYPE_FREE);
949 MPASS(bt->bt_size >= size);
951 if (bt->bt_start != start) {
952 btprev = bt_alloc(vm);
953 btprev->bt_type = BT_TYPE_FREE;
954 btprev->bt_start = bt->bt_start;
955 btprev->bt_size = start - bt->bt_start;
956 bt->bt_start = start;
957 bt->bt_size -= btprev->bt_size;
958 bt_insfree(vm, btprev);
959 bt_insseg(vm, btprev,
960 TAILQ_PREV(bt, vmem_seglist, bt_seglist));
962 MPASS(bt->bt_start == start);
963 if (bt->bt_size != size && bt->bt_size - size > vm->vm_quantum_mask) {
965 btnew = bt_alloc(vm);
966 btnew->bt_type = BT_TYPE_BUSY;
967 btnew->bt_start = bt->bt_start;
968 btnew->bt_size = size;
969 bt->bt_start = bt->bt_start + size;
973 TAILQ_PREV(bt, vmem_seglist, bt_seglist));
974 bt_insbusy(vm, btnew);
977 bt->bt_type = BT_TYPE_BUSY;
980 MPASS(bt->bt_size >= size);
984 vmem_try_fetch(vmem_t *vm, const vmem_size_t size, vmem_size_t align, int flags)
988 VMEM_ASSERT_LOCKED(vm);
991 * XXX it is possible to fail to meet xalloc constraints with the
992 * imported region. It is up to the user to specify the
993 * import quantum such that it can satisfy any allocation.
995 if (vmem_import(vm, size, align, flags) == 0)
999 * Try to free some space from the quantum cache or reclaim
1000 * functions if available.
1002 if (vm->vm_qcache_max != 0 || vm->vm_reclaimfn != NULL) {
1003 avail = vm->vm_size - vm->vm_inuse;
1005 if (vm->vm_qcache_max != 0)
1007 if (vm->vm_reclaimfn != NULL)
1008 vm->vm_reclaimfn(vm, flags);
1010 /* If we were successful retry even NOWAIT. */
1011 if (vm->vm_size - vm->vm_inuse > avail)
1014 if ((flags & M_NOWAIT) != 0)
1016 VMEM_CONDVAR_WAIT(vm);
1021 vmem_try_release(vmem_t *vm, struct vmem_btag *bt, const bool remfree)
1023 struct vmem_btag *prev;
1025 MPASS(bt->bt_type == BT_TYPE_FREE);
1027 if (vm->vm_releasefn == NULL)
1030 prev = TAILQ_PREV(bt, vmem_seglist, bt_seglist);
1031 MPASS(prev != NULL);
1032 MPASS(prev->bt_type != BT_TYPE_FREE);
1034 if (prev->bt_type == BT_TYPE_SPAN && prev->bt_size == bt->bt_size) {
1035 vmem_addr_t spanaddr;
1036 vmem_size_t spansize;
1038 MPASS(prev->bt_start == bt->bt_start);
1039 spanaddr = prev->bt_start;
1040 spansize = prev->bt_size;
1044 bt_remseg(vm, prev);
1045 vm->vm_size -= spansize;
1046 VMEM_CONDVAR_BROADCAST(vm);
1047 bt_freetrim(vm, BT_MAXFREE);
1048 vm->vm_releasefn(vm->vm_arg, spanaddr, spansize);
1055 vmem_xalloc_nextfit(vmem_t *vm, const vmem_size_t size, vmem_size_t align,
1056 const vmem_size_t phase, const vmem_size_t nocross, int flags,
1059 struct vmem_btag *bt, *cursor, *next, *prev;
1066 * Make sure we have enough tags to complete the operation.
1068 if (vm->vm_nfreetags < BT_MAXALLOC && bt_fill(vm, flags) != 0)
1072 * Find the next free tag meeting our constraints. If one is found,
1073 * perform the allocation.
1075 for (cursor = &vm->vm_cursor, bt = TAILQ_NEXT(cursor, bt_seglist);
1076 bt != cursor; bt = TAILQ_NEXT(bt, bt_seglist)) {
1078 bt = TAILQ_FIRST(&vm->vm_seglist);
1079 if (bt->bt_type == BT_TYPE_FREE && bt->bt_size >= size &&
1080 (error = vmem_fit(bt, size, align, phase, nocross,
1081 VMEM_ADDR_MIN, VMEM_ADDR_MAX, addrp)) == 0) {
1082 vmem_clip(vm, bt, *addrp, size);
1088 * Try to coalesce free segments around the cursor. If we succeed, and
1089 * have not yet satisfied the allocation request, try again with the
1090 * newly coalesced segment.
1092 if ((next = TAILQ_NEXT(cursor, bt_seglist)) != NULL &&
1093 (prev = TAILQ_PREV(cursor, vmem_seglist, bt_seglist)) != NULL &&
1094 next->bt_type == BT_TYPE_FREE && prev->bt_type == BT_TYPE_FREE &&
1095 prev->bt_start + prev->bt_size == next->bt_start) {
1096 prev->bt_size += next->bt_size;
1097 bt_remfree(vm, next);
1098 bt_remseg(vm, next);
1101 * The coalesced segment might be able to satisfy our request.
1102 * If not, we might need to release it from the arena.
1104 if (error == ENOMEM && prev->bt_size >= size &&
1105 (error = vmem_fit(prev, size, align, phase, nocross,
1106 VMEM_ADDR_MIN, VMEM_ADDR_MAX, addrp)) == 0) {
1107 vmem_clip(vm, prev, *addrp, size);
1110 (void)vmem_try_release(vm, prev, true);
1114 * If the allocation was successful, advance the cursor.
1117 TAILQ_REMOVE(&vm->vm_seglist, cursor, bt_seglist);
1118 for (; bt != NULL && bt->bt_start < *addrp + size;
1119 bt = TAILQ_NEXT(bt, bt_seglist))
1122 TAILQ_INSERT_BEFORE(bt, cursor, bt_seglist);
1124 TAILQ_INSERT_HEAD(&vm->vm_seglist, cursor, bt_seglist);
1128 * Attempt to bring additional resources into the arena. If that fails
1129 * and M_WAITOK is specified, sleep waiting for resources to be freed.
1131 if (error == ENOMEM && vmem_try_fetch(vm, size, align, flags))
1142 vmem_set_import(vmem_t *vm, vmem_import_t *importfn,
1143 vmem_release_t *releasefn, void *arg, vmem_size_t import_quantum)
1147 vm->vm_importfn = importfn;
1148 vm->vm_releasefn = releasefn;
1150 vm->vm_import_quantum = import_quantum;
1155 vmem_set_limit(vmem_t *vm, vmem_size_t limit)
1159 vm->vm_limit = limit;
1164 vmem_set_reclaim(vmem_t *vm, vmem_reclaim_t *reclaimfn)
1168 vm->vm_reclaimfn = reclaimfn;
1173 * vmem_init: Initializes vmem arena.
1176 vmem_init(vmem_t *vm, const char *name, vmem_addr_t base, vmem_size_t size,
1177 vmem_size_t quantum, vmem_size_t qcache_max, int flags)
1182 MPASS((quantum & (quantum - 1)) == 0);
1184 bzero(vm, sizeof(*vm));
1186 VMEM_CONDVAR_INIT(vm, name);
1187 VMEM_LOCK_INIT(vm, name);
1188 vm->vm_nfreetags = 0;
1189 LIST_INIT(&vm->vm_freetags);
1190 strlcpy(vm->vm_name, name, sizeof(vm->vm_name));
1191 vm->vm_quantum_mask = quantum - 1;
1192 vm->vm_quantum_shift = flsl(quantum) - 1;
1193 vm->vm_nbusytag = 0;
1197 qc_init(vm, qcache_max);
1199 TAILQ_INIT(&vm->vm_seglist);
1200 vm->vm_cursor.bt_start = vm->vm_cursor.bt_size = 0;
1201 vm->vm_cursor.bt_type = BT_TYPE_CURSOR;
1202 TAILQ_INSERT_TAIL(&vm->vm_seglist, &vm->vm_cursor, bt_seglist);
1204 for (i = 0; i < VMEM_MAXORDER; i++)
1205 LIST_INIT(&vm->vm_freelist[i]);
1207 memset(&vm->vm_hash0, 0, sizeof(vm->vm_hash0));
1208 vm->vm_hashsize = VMEM_HASHSIZE_MIN;
1209 vm->vm_hashlist = vm->vm_hash0;
1212 if (vmem_add(vm, base, size, flags) != 0) {
1218 mtx_lock(&vmem_list_lock);
1219 LIST_INSERT_HEAD(&vmem_list, vm, vm_alllist);
1220 mtx_unlock(&vmem_list_lock);
1226 * vmem_create: create an arena.
1229 vmem_create(const char *name, vmem_addr_t base, vmem_size_t size,
1230 vmem_size_t quantum, vmem_size_t qcache_max, int flags)
1235 vm = uma_zalloc(vmem_zone, flags & (M_WAITOK|M_NOWAIT));
1238 if (vmem_init(vm, name, base, size, quantum, qcache_max,
1245 vmem_destroy(vmem_t *vm)
1248 mtx_lock(&vmem_list_lock);
1249 LIST_REMOVE(vm, vm_alllist);
1250 mtx_unlock(&vmem_list_lock);
1256 vmem_roundup_size(vmem_t *vm, vmem_size_t size)
1259 return (size + vm->vm_quantum_mask) & ~vm->vm_quantum_mask;
1263 * vmem_alloc: allocate resource from the arena.
1266 vmem_alloc(vmem_t *vm, vmem_size_t size, int flags, vmem_addr_t *addrp)
1268 const int strat __unused = flags & VMEM_FITMASK;
1271 flags &= VMEM_FLAGS;
1273 MPASS(strat == M_BESTFIT || strat == M_FIRSTFIT || strat == M_NEXTFIT);
1274 if ((flags & M_NOWAIT) == 0)
1275 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "vmem_alloc");
1277 if (size <= vm->vm_qcache_max) {
1279 * Resource 0 cannot be cached, so avoid a blocking allocation
1280 * in qc_import() and give the vmem_xalloc() call below a chance
1283 qc = &vm->vm_qcache[(size - 1) >> vm->vm_quantum_shift];
1284 *addrp = (vmem_addr_t)uma_zalloc(qc->qc_cache,
1285 (flags & ~M_WAITOK) | M_NOWAIT);
1286 if (__predict_true(*addrp != 0))
1290 return (vmem_xalloc(vm, size, 0, 0, 0, VMEM_ADDR_MIN, VMEM_ADDR_MAX,
1295 vmem_xalloc(vmem_t *vm, const vmem_size_t size0, vmem_size_t align,
1296 const vmem_size_t phase, const vmem_size_t nocross,
1297 const vmem_addr_t minaddr, const vmem_addr_t maxaddr, int flags,
1300 const vmem_size_t size = vmem_roundup_size(vm, size0);
1301 struct vmem_freelist *list;
1302 struct vmem_freelist *first;
1303 struct vmem_freelist *end;
1308 flags &= VMEM_FLAGS;
1309 strat = flags & VMEM_FITMASK;
1312 MPASS(strat == M_BESTFIT || strat == M_FIRSTFIT || strat == M_NEXTFIT);
1313 MPASS((flags & (M_NOWAIT|M_WAITOK)) != (M_NOWAIT|M_WAITOK));
1314 if ((flags & M_NOWAIT) == 0)
1315 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "vmem_xalloc");
1316 MPASS((align & vm->vm_quantum_mask) == 0);
1317 MPASS((align & (align - 1)) == 0);
1318 MPASS((phase & vm->vm_quantum_mask) == 0);
1319 MPASS((nocross & vm->vm_quantum_mask) == 0);
1320 MPASS((nocross & (nocross - 1)) == 0);
1321 MPASS((align == 0 && phase == 0) || phase < align);
1322 MPASS(nocross == 0 || nocross >= size);
1323 MPASS(minaddr <= maxaddr);
1324 MPASS(!VMEM_CROSS_P(phase, phase + size - 1, nocross));
1325 if (strat == M_NEXTFIT)
1326 MPASS(minaddr == VMEM_ADDR_MIN && maxaddr == VMEM_ADDR_MAX);
1329 align = vm->vm_quantum_mask + 1;
1333 * Next-fit allocations don't use the freelists.
1335 if (strat == M_NEXTFIT)
1336 return (vmem_xalloc_nextfit(vm, size0, align, phase, nocross,
1339 end = &vm->vm_freelist[VMEM_MAXORDER];
1341 * choose a free block from which we allocate.
1343 first = bt_freehead_toalloc(vm, size, strat);
1347 * Make sure we have enough tags to complete the
1350 if (vm->vm_nfreetags < BT_MAXALLOC &&
1351 bt_fill(vm, flags) != 0) {
1357 * Scan freelists looking for a tag that satisfies the
1358 * allocation. If we're doing BESTFIT we may encounter
1359 * sizes below the request. If we're doing FIRSTFIT we
1360 * inspect only the first element from each list.
1362 for (list = first; list < end; list++) {
1363 LIST_FOREACH(bt, list, bt_freelist) {
1364 if (bt->bt_size >= size) {
1365 error = vmem_fit(bt, size, align, phase,
1366 nocross, minaddr, maxaddr, addrp);
1368 vmem_clip(vm, bt, *addrp, size);
1372 /* FIRST skips to the next list. */
1373 if (strat == M_FIRSTFIT)
1379 * Retry if the fast algorithm failed.
1381 if (strat == M_FIRSTFIT) {
1383 first = bt_freehead_toalloc(vm, size, strat);
1388 * Try a few measures to bring additional resources into the
1389 * arena. If all else fails, we will sleep waiting for
1390 * resources to be freed.
1392 if (!vmem_try_fetch(vm, size, align, flags)) {
1399 if (error != 0 && (flags & M_NOWAIT) == 0)
1400 panic("failed to allocate waiting allocation\n");
1406 * vmem_free: free the resource to the arena.
1409 vmem_free(vmem_t *vm, vmem_addr_t addr, vmem_size_t size)
1414 if (size <= vm->vm_qcache_max &&
1415 __predict_true(addr >= VMEM_ADDR_QCACHE_MIN)) {
1416 qc = &vm->vm_qcache[(size - 1) >> vm->vm_quantum_shift];
1417 uma_zfree(qc->qc_cache, (void *)addr);
1419 vmem_xfree(vm, addr, size);
1423 vmem_xfree(vmem_t *vm, vmem_addr_t addr, vmem_size_t size)
1431 bt = bt_lookupbusy(vm, addr);
1433 MPASS(bt->bt_start == addr);
1434 MPASS(bt->bt_size == vmem_roundup_size(vm, size) ||
1435 bt->bt_size - vmem_roundup_size(vm, size) <= vm->vm_quantum_mask);
1436 MPASS(bt->bt_type == BT_TYPE_BUSY);
1438 bt->bt_type = BT_TYPE_FREE;
1441 t = TAILQ_NEXT(bt, bt_seglist);
1442 if (t != NULL && t->bt_type == BT_TYPE_FREE) {
1443 MPASS(BT_END(bt) < t->bt_start); /* YYY */
1444 bt->bt_size += t->bt_size;
1448 t = TAILQ_PREV(bt, vmem_seglist, bt_seglist);
1449 if (t != NULL && t->bt_type == BT_TYPE_FREE) {
1450 MPASS(BT_END(t) < bt->bt_start); /* YYY */
1451 bt->bt_size += t->bt_size;
1452 bt->bt_start = t->bt_start;
1457 if (!vmem_try_release(vm, bt, false)) {
1459 VMEM_CONDVAR_BROADCAST(vm);
1460 bt_freetrim(vm, BT_MAXFREE);
1469 vmem_add(vmem_t *vm, vmem_addr_t addr, vmem_size_t size, int flags)
1474 flags &= VMEM_FLAGS;
1476 if (vm->vm_nfreetags >= BT_MAXALLOC || bt_fill(vm, flags) == 0)
1477 vmem_add1(vm, addr, size, BT_TYPE_SPAN_STATIC);
1486 * vmem_size: information about arenas size
1489 vmem_size(vmem_t *vm, int typemask)
1495 return vm->vm_inuse;
1497 return vm->vm_size - vm->vm_inuse;
1498 case VMEM_FREE|VMEM_ALLOC:
1502 for (i = VMEM_MAXORDER - 1; i >= 0; i--) {
1503 if (LIST_EMPTY(&vm->vm_freelist[i]))
1506 return ((vmem_size_t)ORDER2SIZE(i) <<
1507 vm->vm_quantum_shift);
1518 #if defined(DDB) || defined(DIAGNOSTIC)
1520 static void bt_dump(const bt_t *, int (*)(const char *, ...)
1521 __printflike(1, 2));
1524 bt_type_string(int type)
1534 case BT_TYPE_SPAN_STATIC:
1535 return "static span";
1536 case BT_TYPE_CURSOR:
1545 bt_dump(const bt_t *bt, int (*pr)(const char *, ...))
1548 (*pr)("\t%p: %jx %jx, %d(%s)\n",
1549 bt, (intmax_t)bt->bt_start, (intmax_t)bt->bt_size,
1550 bt->bt_type, bt_type_string(bt->bt_type));
1554 vmem_dump(const vmem_t *vm , int (*pr)(const char *, ...) __printflike(1, 2))
1559 (*pr)("vmem %p '%s'\n", vm, vm->vm_name);
1560 TAILQ_FOREACH(bt, &vm->vm_seglist, bt_seglist) {
1564 for (i = 0; i < VMEM_MAXORDER; i++) {
1565 const struct vmem_freelist *fl = &vm->vm_freelist[i];
1567 if (LIST_EMPTY(fl)) {
1571 (*pr)("freelist[%d]\n", i);
1572 LIST_FOREACH(bt, fl, bt_freelist) {
1578 #endif /* defined(DDB) || defined(DIAGNOSTIC) */
1581 #include <ddb/ddb.h>
1584 vmem_whatis_lookup(vmem_t *vm, vmem_addr_t addr)
1588 TAILQ_FOREACH(bt, &vm->vm_seglist, bt_seglist) {
1589 if (BT_ISSPAN_P(bt)) {
1592 if (bt->bt_start <= addr && addr <= BT_END(bt)) {
1601 vmem_whatis(vmem_addr_t addr, int (*pr)(const char *, ...))
1605 LIST_FOREACH(vm, &vmem_list, vm_alllist) {
1608 bt = vmem_whatis_lookup(vm, addr);
1612 (*pr)("%p is %p+%zu in VMEM '%s' (%s)\n",
1613 (void *)addr, (void *)bt->bt_start,
1614 (vmem_size_t)(addr - bt->bt_start), vm->vm_name,
1615 (bt->bt_type == BT_TYPE_BUSY) ? "allocated" : "free");
1620 vmem_printall(const char *modif, int (*pr)(const char *, ...))
1624 LIST_FOREACH(vm, &vmem_list, vm_alllist) {
1630 vmem_print(vmem_addr_t addr, const char *modif, int (*pr)(const char *, ...))
1632 const vmem_t *vm = (const void *)addr;
1637 DB_SHOW_COMMAND(vmemdump, vmemdump)
1641 db_printf("usage: show vmemdump <addr>\n");
1645 vmem_dump((const vmem_t *)addr, db_printf);
1648 DB_SHOW_ALL_COMMAND(vmemdump, vmemdumpall)
1652 LIST_FOREACH(vm, &vmem_list, vm_alllist)
1653 vmem_dump(vm, db_printf);
1656 DB_SHOW_COMMAND(vmem, vmem_summ)
1658 const vmem_t *vm = (const void *)addr;
1660 size_t ft[VMEM_MAXORDER], ut[VMEM_MAXORDER];
1661 size_t fs[VMEM_MAXORDER], us[VMEM_MAXORDER];
1665 db_printf("usage: show vmem <addr>\n");
1669 db_printf("vmem %p '%s'\n", vm, vm->vm_name);
1670 db_printf("\tquantum:\t%zu\n", vm->vm_quantum_mask + 1);
1671 db_printf("\tsize:\t%zu\n", vm->vm_size);
1672 db_printf("\tinuse:\t%zu\n", vm->vm_inuse);
1673 db_printf("\tfree:\t%zu\n", vm->vm_size - vm->vm_inuse);
1674 db_printf("\tbusy tags:\t%d\n", vm->vm_nbusytag);
1675 db_printf("\tfree tags:\t%d\n", vm->vm_nfreetags);
1677 memset(&ft, 0, sizeof(ft));
1678 memset(&ut, 0, sizeof(ut));
1679 memset(&fs, 0, sizeof(fs));
1680 memset(&us, 0, sizeof(us));
1681 TAILQ_FOREACH(bt, &vm->vm_seglist, bt_seglist) {
1682 ord = SIZE2ORDER(bt->bt_size >> vm->vm_quantum_shift);
1683 if (bt->bt_type == BT_TYPE_BUSY) {
1685 us[ord] += bt->bt_size;
1686 } else if (bt->bt_type == BT_TYPE_FREE) {
1688 fs[ord] += bt->bt_size;
1691 db_printf("\t\t\tinuse\tsize\t\tfree\tsize\n");
1692 for (ord = 0; ord < VMEM_MAXORDER; ord++) {
1693 if (ut[ord] == 0 && ft[ord] == 0)
1695 db_printf("\t%-15zu %zu\t%-15zu %zu\t%-16zu\n",
1696 ORDER2SIZE(ord) << vm->vm_quantum_shift,
1697 ut[ord], us[ord], ft[ord], fs[ord]);
1701 DB_SHOW_ALL_COMMAND(vmem, vmem_summall)
1705 LIST_FOREACH(vm, &vmem_list, vm_alllist)
1706 vmem_summ((db_expr_t)vm, TRUE, count, modif);
1708 #endif /* defined(DDB) */
1710 #define vmem_printf printf
1712 #if defined(DIAGNOSTIC)
1715 vmem_check_sanity(vmem_t *vm)
1717 const bt_t *bt, *bt2;
1721 TAILQ_FOREACH(bt, &vm->vm_seglist, bt_seglist) {
1722 if (bt->bt_start > BT_END(bt)) {
1723 printf("corrupted tag\n");
1724 bt_dump(bt, vmem_printf);
1728 TAILQ_FOREACH(bt, &vm->vm_seglist, bt_seglist) {
1729 if (bt->bt_type == BT_TYPE_CURSOR) {
1730 if (bt->bt_start != 0 || bt->bt_size != 0) {
1731 printf("corrupted cursor\n");
1736 TAILQ_FOREACH(bt2, &vm->vm_seglist, bt_seglist) {
1740 if (bt2->bt_type == BT_TYPE_CURSOR) {
1743 if (BT_ISSPAN_P(bt) != BT_ISSPAN_P(bt2)) {
1746 if (bt->bt_start <= BT_END(bt2) &&
1747 bt2->bt_start <= BT_END(bt)) {
1748 printf("overwrapped tags\n");
1749 bt_dump(bt, vmem_printf);
1750 bt_dump(bt2, vmem_printf);
1760 vmem_check(vmem_t *vm)
1763 if (!vmem_check_sanity(vm)) {
1764 panic("insanity vmem %p", vm);
1768 #endif /* defined(DIAGNOSTIC) */